In article 40NYh.22211$n_.17913@attbi_s21,
says...


Please take the suggestions you receive seriously. No one here can see your
workbench or know some of the things you know about the equipment you're
working on.

They should at least know that an ancient tube receiver is not going to have
more than one input. It's rare for a tube receiver to even have a single AUX
input, only high-end models had an input. I was hoping to hear from people
with experience with tube receivers, and people who suggest testing a matrix of
inputs clearly do not.